... by Cu2+, Mn2+, Co2 + ions [7-11] In this paper, we study the role of color luminescence centers Cu, Mn, Co in the semiconductors with wide band gap of ZnS, ZnO and test application of ZnS:Cu material ... band is greater than that of the blue band As increasing the concentration of Cu, the intensity of the blue band decreases while the intensity of the green band increases and reaches to maximum ... shows the PL spectra of bulk sample ZnO :Co with variation of Co concentration When Co (xCo = 2.10-2 mol%) was doped in ZnO, the presence of Co2 + ions resulted in change in the PL spectrum of ZnO...